A marine single-sided mounted multi-stage removable sealing plugging device

Abstract

This invention provides a marine single-sided mounting multi-stage removable sealing device, comprising a primary sealing base and a secondary sealing base. The primary sealing base is composed of at least two axially mirror-symmetrically arranged split sealing units spliced ​​together. The primary sealing base includes a sealing section with a radial width greater than the diameter of the bulkhead opening, and a connecting rod perpendicularly connected to one side of the sealing section and passing through the bulkhead opening. The secondary sealing base has a radial width greater than the diameter of the bulkhead opening. The secondary sealing base and the sealing section are located on opposite sides of the bulkhead opening, respectively, for sealing the bulkhead opening. The connecting rod passes through the secondary sealing base and is detachably connected to it. This removable sealing device achieves multi-stage compression sealing, is easy to install and disassemble quickly without damaging the structural material, and is a reusable sealing device. It can be installed and sealed from a single outer side of the hull and is suitable for temporary sealing of pipe penetrations, process holes, and other locations.

Description

Technical Field

[0001] This invention belongs to the field of shipbuilding technology, specifically relating to a marine single-sided installed multi-stage removable sealing and plugging device. Background Technology

[0002] In the construction and maintenance of ships, floating production storage and offloading (FPSO) units, drilling platforms, and other large enclosed container structures, numerous process-related lightweight openings are typically created in the bulkheads to achieve lightweight design. These openings are permissible under normal operating conditions, but temporary closure is necessary during construction or maintenance to create effective pressure testing space.

[0003] Currently, the commonly used method on-site is welding sealing: the opening is covered with a steel plate of the same material as the bulkhead and fixed with continuous fillet welds. After the test, the patch plate is removed using carbon arc gouging or flame cutting, followed by grinding and finishing. This method has significant drawbacks: 1. Cumbersome procedures and low efficiency: Welding and dismantling both require professional personnel, which is time-consuming and affects the overall construction progress; 2. High risk of damage in the heat-affected zone: The high temperature generated during the welding process may cause local deformation of the bulkhead, increase residual stress, and even trigger microcracks, damaging the structural integrity; 3. Irreversible damage and material waste: Each sealing operation consumes new steel and welding materials, which cannot be reused, resulting in resource waste; 4. High operational safety risks: Hot work in confined spaces can easily cause fires or explosions, posing significant safety hazards; 5. Difficult to adapt to single-sided restricted working conditions: When the opening is located in a position that is difficult to access from both sides (such as a narrow interlayer or internal dead corner), traditional double-sided clamping sealing devices cannot be used.

[0004] Although some mechanical sealing tools have been developed, such as expansion plugs and flange clamps, most still require bilateral operation or rely on complex support structures, failing to meet the comprehensive requirements of "single-sided installation, self-locking fastening, and multi-stage sealing." Therefore, developing a temporary sealing device that is simple in structure, easy to operate, provides reliable sealing, supports single-sided operation, and can be reused has become an urgent technical challenge in the current shipbuilding industry. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a marine single-sided installation type multi-stage sealing and detachable plugging device. This reusable plugging device achieves multi-stage compression sealing, is easy to install and disassemble quickly without damaging the structural base material, and can be installed and sealed from a single outer side of the hull. It is suitable for temporary plugging of pipe penetration holes, process holes, and other parts.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A marine single-sided mounted multi-stage detachable sealing plugging device includes a primary sealing base and a secondary sealing base. The primary sealing base is composed of at least two axially mirror-symmetrically arranged split sealing units spliced ​​together. The primary sealing base includes a plugging section with a radial width greater than the diameter of the bulkhead opening and a connecting rod perpendicularly connected to one side of the plugging section and passing through the bulkhead opening. The secondary sealing base has a radial width greater than the diameter of the bulkhead opening. The secondary sealing base and the plugging section are located on opposite sides of the bulkhead opening and are used to seal the bulkhead opening. The connecting rod passes through the secondary sealing base and is detachably connected to it.

[0007] Furthermore, the two mirror-symmetrically arranged split sealing units are detachably assembled through a tenon-and-mortise structure set on their opposite surfaces and distributed along their axial direction.

[0008] Furthermore, the mortise and tenon structure includes a convex key and a groove arranged opposite to each other in two separate sealing units. A slot is provided on one side of the convex key. A through hole communicating with the groove is provided on the separate sealing unit with the groove. A stop block extending into the slot is inserted into the through hole. The convex key and the groove are arranged alternately in at least two sets along the circumferential direction.

[0009] Furthermore, the stop block is an elastic T-shaped block with a hollow structure in the vertical part of the stop block. At least two pull ropes are provided in the hollow structure. One end of each of the at least two pull ropes passes through the horizontal part of the stop block and is connected to a pull head assembly. The other ends are dispersed and fixedly connected to the inner sidewall of the hollow structure.

[0010] Furthermore, a threaded sleeve is provided on the side of the sealing section where the connecting rod is located, and the threaded sleeve is coaxially arranged with the connecting rod. One end of the connecting rod extends into the threaded sleeve.

[0011] Furthermore, the secondary sealing substrate is a sealing cover, which is fastened to one side wall of the opening in the bulkhead, and the connecting rod passes through the sealing cover and is detachably connected to it.

[0012] Furthermore, two internally threaded openings are provided on the closed end face of the sealing cover, which are respectively connected to a pressure gauge and an air pump. After the sealing device is installed, gas is injected to maintain a certain atmospheric pressure for a certain period of time to test its sealing performance. Two slots are mirror-symmetrically arranged on the circumferential side wall of the sealing cover. When in use, the assist rod is inserted into the two slots and rotated.

[0013] Furthermore, a threaded hole or a threaded sleeve is provided on the closed end face of the sealing cover, and the connecting rod is a threaded connecting rod. The sealing cover is screwed to the threaded connecting rod through the threaded hole or the threaded sleeve.

[0014] Furthermore, the sealing device also includes a third-level sealing substrate, which is a locking gland. The connecting rod passes through the locking gland and is detachably connected to it. After the sealing device is installed, the third-level sealing substrate is located inside the second-level sealing substrate and is sealed and fitted to the bulkhead.

[0015] Furthermore, a nut for tightening the locking cover is screwed onto the threaded connecting rod located between the closed end of the locking cover and the sealing cover.

[0016] Furthermore, a sealing ring is provided between the end faces of the primary sealing body, the secondary sealing body and the tertiary sealing body and the bulkhead. A first groove and a second groove are formed on the side of the sealing ring that contacts the bulkhead. The depth of the first groove is greater than the depth of the second groove. The first groove is close to the opening of the bulkhead.

[0017] This invention utilizes a segmented, stepped, single-stage sealing base design, enabling the installation of sealing components larger than the opening from only one side of the hull. A series of threaded clamping mechanisms achieves multi-stage, multi-directional synchronous clamping and sealing. The protective cover design enhances the sealing device's resistance to environmental interference. The entire system is compact, quick to install and disassemble, provides excellent sealing, and is reusable, significantly improving the efficiency and safety of temporary sealing operations during shipbuilding or repair.

[0018] The marine single-sided mounted multi-stage removable sealing plugging device of the present invention has the following advantages: 1. Quick assembly and disassembly: With its split design and spiral fastening, it eliminates the need for welding and cutting, allowing for assembly or disassembly to be completed within minutes, increasing work efficiency several times over; 2. Non-destructive sealing: Purely mechanical connection, completely avoiding the heat-affected zone of welding and the damage to the bulkhead material caused by cutting; 3. Reliable sealing: The screw mechanism provides a stable clamping force, which, together with the sealing ring, can withstand the air or water pressure required for the tightness test; 4. High versatility: Devices of corresponding specifications can be designed according to different sizes of light-reducing holes, making them highly adaptable; 5. Reusable: The device has a robust structure and can be reused multiple times. The cost per use is extremely low, making it economical. Attached Figure Description

[0019] Figure 1This is a front view of the single-sided mounted multi-stage sealing and detachable plugging device described in this invention.

[0020] Figure 2 This is a front view of the separable sealing substrate described in this invention.

[0021] Figure 3 This is a front view of the separable sealing substrate described in this invention after disassembly.

[0022] Figure 4 for Figure 3 View from direction A in the image.

[0023] Figure 5 This is a schematic diagram of the mortise and tenon structure.

[0024] Figure 6 This is a schematic diagram of the block structure.

[0025] Figure 7 for Figure 1 An enlarged schematic diagram of section C.

[0026] Among them, 1-separable sealing base, 2-split sealing unit, 3-groove, 4-protruding key, 5-stop block, 6-sealing ring, 7-threaded section, 8-sealing gasket, 9-bulk body, 10-bulk body opening, 11-pressure gauge, 12-threaded sleeve, 13-inflation port, 14-sealing plug, 15-slot, 16-locking gland, 17-sealing cover, 18-nut, 19-helping rod, 101-sealing section, 102-connecting rod, 41-slot, 501-pull rope, 502-hinge, 503-pull ring, 504-pull block, 601-first groove, 602-second groove. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1-7As shown, a marine single-sided mounted multi-stage detachable sealing plugging device includes a primary sealing base 1 and a secondary sealing base. The primary sealing base 1 is composed of at least two axially mirror-symmetrically arranged split sealing units 2. The primary sealing base 1 includes a plugging section 101 with a radial width greater than the diameter of the bulkhead opening 10, and a connecting rod 102 perpendicularly connected to one side of the plugging section 11 and passing through the bulkhead opening 10. The secondary sealing base has a radial width greater than the diameter of the bulkhead opening 10. The secondary sealing base and the plugging section 11 are located on both sides of the bulkhead opening 10, respectively, for sealing the bulkhead opening 10. The connecting rod 102 passes through the secondary sealing base and is detachably connected to it. The outer diameter of the plugging section 101 is greater than the diameter of the bulkhead opening 10, and it is used to be snapped into the inner side of the bulkhead 9 after assembly, serving as the main load-bearing sealing base.

[0029] Specifically, the two mirror-symmetrically arranged split sealing units 2 are detachable and can be spliced ​​together by means of mortise and tenon structures arranged on their opposite surfaces and distributed along their axial direction.

[0030] More specifically, the mortise and tenon structure includes two opposing split sealing units 2 with protruding keys 4 and grooves 3. A slot 41 is provided on one side of the protruding key 4. A through hole is provided on the split sealing unit 2 with the groove 3, communicating with the groove 3. A stop block 5 extending into the slot 41 is inserted into the through hole. The protruding keys 4 and grooves 3 are arranged in at least two sets in a staggered manner along the circumference to prevent relative rotation after splicing.

[0031] The stop block 5 is an elastic T-shaped block with a hollow structure in the vertical part. At least two pull ropes 501 are provided in the hollow structure. One end of each pull rope 501 passes through the horizontal part of the stop block and is connected to a pull head assembly. The other ends are dispersed and fixedly connected to the inner sidewall of the hollow structure.

[0032] Specifically, in some embodiments, the pull head assembly includes a pull block 504, one end of the pull cord 501 is fixedly connected to the top surface of the pull block 504, and two pull rings 503 are rotatably connected to the circumferential side of the pull block 504 via hinges 502.

[0033] Understandably, the primary sealing substrate 1 is virtually divided into N (N≥2) sector-shaped modules of identical shape and size along its central axis. Each sector-shaped module has matching protrusions 4 and grooves 3 on its two radial sides. When all sector-shaped modules are assembled around the central axis, the interlocking of the protrusions and grooves forms a complete stepped shaft-like substrate. This design allows the substrate to be disassembled into multiple modules, which are then sequentially passed through the hull opening from the smaller diameter side and reassembled outside the opening. After assembly, the axially limiting stepped surface abuts against the hull surface outside the opening, achieving initial radial limiting and primary sealing.

[0034] The primary sealing base 1 is assembled from multiple parts on the inner side of the chamber. The inner side will deform under great stress. By adding a stop block 5, a double insurance is provided to prevent the cracking of multiple split sealing units. A screw sleeve is added to the end of the connecting rod near the sealing section, providing triple insurance to prevent deformation and leakage of the primary sealing base 1.

[0035] A threaded sleeve 12 is provided on the side of the sealing section 11 where the connecting rod 102 is provided, and one end of the connecting rod 102 extends into the threaded sleeve 12.

[0036] In some embodiments, the secondary sealing substrate is a sealing cover 17, which is fastened to one side wall of the bulkhead opening 10. The connecting rod 102 passes through the sealing cover 17 and is detachably connected to it. The sealing cover 17 is a hollow rotating structure, and its shape is bowl-shaped or bell-shaped.

[0037] Furthermore, an opening with internal threads and an air inlet 13 are provided on the closed end face of the sealing cover 17, which are respectively connected to a pressure gauge 11 and an air pump. A sealing plug 14 is connected to the air inlet 13. After the sealing device is installed, gas is injected to maintain a certain atmospheric pressure for a certain period of time to test its sealing performance. Two slots 41 are mirror-symmetrically arranged on the circumferential side wall of the sealing cover 17. When in use, the assisting rod 19 is inserted into the two slots 41 and rotated.

[0038] The sealing cover 17 has a threaded hole or a threaded sleeve 12 on its closed end face. The connecting rod 102 is a threaded connecting rod 102. The sealing cover 17 is screwed to the threaded connecting rod 102 through the threaded hole or the threaded sleeve 12.

[0039] Specifically, the sealing device further includes a third-level sealing base, which is a locking cap 16. The connecting rod 102 passes through the locking cap 16 and is detachably connected to it. After the sealing device is installed, the third-level sealing base is located inside the second-level sealing base and is sealed and fitted to the bulkhead 9. After the sealing cover 17 is screwed into place, it covers the second-level locking cap and the surrounding area, forming a third-level environmental protection and additional sealing barrier.

[0040] Furthermore, a nut 18 for tightening the locking cover 16 is screwed onto the threaded connecting rod 102 located between the closed end of the locking cover 16 and the sealing cover 17.

[0041] Furthermore, a sealing ring 6 is provided between the end faces of the primary sealing body, the secondary sealing body, and the tertiary sealing body and the bulkhead 9. A first groove 601 and a second groove 602 are formed on the side of the sealing ring 6 that contacts the bulkhead 9. The depth of the first groove 601 is greater than the depth of the second groove 602. The first groove 601 is close to the opening 10 of the bulkhead. The sealing ring is a U-shaped ring, an O-ring, a rectangular ring, or other elastic sealing element.

[0042] Two grooves are made on the side of the sealing ring 6 that contacts the bulkhead. Considering the large internal deformation due to compression, the first groove 601 is closer to the center of gravity of the opening in the bulkhead, so as to reserve space for deformation.

[0043] Compared with existing technologies, the present invention has the following significant advantages: It truly enables single-sided installation and disassembly: all operations can be completed inside the cabin, and the modular structure can be automatically assembled on the outside after being perforated piece by piece, making it particularly suitable for complex structural areas that can only be accessed from one side.

[0044] Multi-level sealing ensures high reliability: Through a three-level physical sealing mechanism of "large end stop + pressure cap tightening + cup cover covering", gas or liquid leakage is effectively prevented, meeting the requirements of high pressure tightness test.

[0045] Completely non-destructive operation: The fully mechanical connection eliminates the need for welding, riveting, or bonding, avoiding issues such as thermal deformation, damage to the base material, and residues, thus protecting the integrity of the original structure.

[0046] Quick assembly and disassembly, extremely efficient: a single sealing operation can be completed within 5 minutes, greatly shortening the preparation cycle and improving the overall pace of the tightness test.

[0047] High reusability: All components are standardized and can be cleaned and stored after disassembly. They are suitable for different projects and different sizes of openings (by changing specifications), reducing overall costs.

[0048] It is highly adaptable and versatile: by adjusting the diameter of the large end section, the thread specification and the size of the sealing ring, it can be adapted to various standard light-reducing holes (such as Φ50~Φ200mm range), and has good engineering promotion value.

[0049] High safety: Eliminates the risk of hot work operations, suitable for use in areas with high explosion-proof and fire-resistant ratings.

[0050] In summary, this invention fills the gap in the field of single-sided detachable sealing devices and is particularly suitable for the needs of efficient, environmentally friendly and safe construction processes in the context of modern green shipbuilding and intelligent construction.

[0051] Those skilled in the art should understand that the above description is merely a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A marine single-sided mounted multi-stage removable sealing plugging device, characterized in that, It includes a primary sealing base and a secondary sealing base. The primary sealing base is composed of at least two split sealing units arranged symmetrically in a mirror direction along the axial direction. The primary sealing base includes a sealing section with a radial width greater than the diameter of the bulkhead opening and a connecting rod that is perpendicularly connected to one side of the sealing section and passes through the bulkhead opening. The secondary sealing base has a radial width greater than the diameter of the bulkhead opening. The secondary sealing base and the sealing section are located on both sides of the bulkhead opening and are used to seal the bulkhead opening. The connecting rod passes through the secondary sealing base and is detachably connected to it.

2. The marine single-sided mounted multi-stage removable sealing plugging device according to claim 1, characterized in that, Two mirror-symmetrically arranged split sealing units are detachably spliced ​​through a tenon and mortise structure with concave and convex joints distributed along their axial direction on their opposite surfaces.

3. The marine single-sided installed multi-stage removable sealing plugging device according to claim 2, characterized in that, The mortise and tenon structure includes a key and a groove arranged opposite to each other in two separate sealing units. A slot is provided on one side of the key. A through hole is provided on the separate sealing unit with the groove, and a stop block extending into the slot is inserted into the through hole. The key and the groove are arranged alternately in at least two sets along the circumference.

4. The marine single-sided installed multi-stage removable sealing plugging device according to claim 3, characterized in that, The stop block is an elastic T-shaped block with a hollow structure in the vertical part of the stop block. At least two pull ropes are provided in the hollow structure. One end of each of the at least two pull ropes passes through the horizontal part of the stop block and is connected to a pull head assembly. The other ends are dispersed and fixedly connected to the inner sidewall of the hollow structure.

5. The marine single-sided installed multi-stage removable sealing plugging device according to claim 1, characterized in that, A threaded sleeve is provided on the side of the sealing section where the connecting rod is located, and the threaded sleeve is coaxially arranged with the connecting rod. One end of the connecting rod extends into the threaded sleeve.

6. The marine single-sided installed multi-stage removable sealing plugging device according to claim 1, characterized in that, The secondary sealing substrate is a sealing cover, which is fastened to one side wall of the opening in the bulkhead, and the connecting rod passes through the sealing cover and is detachably connected to it.

7. The marine single-sided installed multi-stage removable sealing plugging device according to claim 6, characterized in that, Two internally threaded openings are provided on the closed end face of the sealing cover, which are respectively connected to a pressure gauge and an air pump. After the sealing device is installed, gas is injected to maintain a certain atmospheric pressure for a certain period of time to test its sealing performance. Two slots are mirror-symmetrically arranged on the circumferential sidewall of the sealing cover. When in use, the assist rod is inserted into the two slots and rotated.

8. The marine single-sided installed multi-stage removable sealing plugging device according to claim 6, characterized in that, The sealing cover has a threaded hole or a threaded sleeve on its closed end face. The connecting rod is a threaded connecting rod, and the sealing cover is screwed to the threaded connecting rod through the threaded hole or the threaded sleeve.

9. The marine single-sided installed multi-stage removable sealing plugging device according to claim 6, characterized in that, The sealing device also includes a three-stage sealing base, which is a locking gland. The connecting rod passes through the locking gland and is detachably connected to it. After the sealing device is installed, the three-stage sealing base is located inside the two-stage sealing base and is sealed and fitted to the bulkhead. A nut for pressing the locking gland is screwed onto the threaded connecting rod located between the closed end of the locking gland and the sealing cover.

10. The marine single-sided mounted multi-stage removable sealing plugging device according to claim 9, characterized in that, A sealing ring is provided between the end faces of the primary sealing body, the secondary sealing body and the tertiary sealing body and the bulkhead. A first groove and a second groove are provided on the side of the sealing ring that contacts the bulkhead. The depth of the first groove is greater than the depth of the second groove. The first groove is close to the opening of the bulkhead.

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